Paper Feed Section; Paper Feed Components - Canon S600 Service Manual

S600

3.3 Paper Feed Section

3.3.1 Paper feed components

The paper feed components include an ASF incorporating a friction separation system
which uses a separation pad. Compared to previous ASF systems, it has a very strong
paper feed force.
It consists of the following parts: Paper feed roller and separation pad, pressure roller
and return corner, pressure plate, motor, and sensor.
Paper feed roller
(Transports
the paper)
Pressure roller
(Applies pressure on
the paper on the
separation pad to
prevent transporting
more than 1 sheet)
Separation pad
(Separates
the paper)
The motor is a constant-current stepping motor. It drives the paper feed roller with 1-
2-phase driving. There is a sensor on the paper feed roller to detect the paper feed
roller's initial position.
The pressure roller and return corner prevent the paper that could not be completely
separated by the separation pad from proceeding to the paper transport section. The
pressure roller presses down the sheet of paper that is on the separation pad. It
prevents multiple sheets from being transported. The paper therefore has a back
tension (counteracting force against the feed roller's pulling force on the paper). Also,
the return corner is for returning the paper remaining on the separation pad. The
timing for returning the paper changes depending on the paper type and length
selected with the printer driver.
Figure 3-11 Paper Feeding
3-17
Part 3: Technical Reference
Nip
Chin
Pressure plate
(Puts the next sheet
in position for the
paper feed roller)
Return pawl
(Returns the paper
remaining on the
separation pad)